Yeah, the guy has been writing and drawing like he has all the time in the world, all the freedom (ironically) but now its catching up to him and he's realising his own mortality as well as ourselves.
His mind and soul might still be young at heart but the body can only go for so long, it can only last for so long ofc.
OP has suffered from far too much ambition ironically, in a series all about ambition as one of its most important themes/factors.